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Helgoland Marine Research

Open Access

Studies on the influence of plankton on antibacterial activity of sea water

  • K. Moebus1
Helgoländer wissenschaftliche Meeresuntersuchungen23:BF01609685


1. Antibacterial activity of sea water againstEscherichia coli, Staphylococcus aureus andSerratia marinorubra, as influenced by enrichment with filter sludge or viable plankton as well as by removal of plankton, was investigated. Inactivation ofS. aureus only was sometimes increased by the enrichments employed.

2. During several experiments, inactivation of the 3 test strains was considerably decreased by enrichment with dead or living particulate matter. Most striking effects of this kind were observed at times of greatly increased bactericidal capacity of untreated sea water.

3. Sometimes, the inactivation ofEscherichia coli andStaphylococcus aureus in sterile filtrates, prepared from the different types of raw sea water used, was the same as or even stronger than in corresponding samples of raw sea water.

4. From the present findings, it is concluded that bactericidal products of planktonic algae in regard to antibacterial activity of sea water are less important than available nutrients.


SludgeAntibacterial ActivityStaphylococcus AureusTest StrainSterile Filtrate